﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Reflection;
using Cn.Cellula.App.Lib.MiniTop;

namespace Cn.Cellula.MiniTop {
    static class Program {
        public static Common.Logging.ILog log = Common.Logging.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main() {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            MySetting ms = MySetting.CreateInstance();
            if (ms.Get(AppKey.OneInstance) == "yes") {
                Process instance = RunningInstance();
                if (instance == null) {
                    Application.Run(FrmDefault.GetInstance());
                } else {
                    //已经有一个实例在运行
                    HandleRunningInstance(instance);
                }
            } else {
                Application.Run(FrmDefault.GetInstance());
            }
        }
        #region  确保程序只运行一个实例
        private static Process RunningInstance() {

            Process current = Process.GetCurrentProcess();
            Process[] processes = Process.GetProcessesByName(current.ProcessName);
            //遍历与当前进程名称相同的进程列表  
            foreach (Process process in processes) {
                //如果实例已经存在则忽略当前进程  
                if (process.Id != current.Id) {
                    //保证要打开的进程同已经存在的进程来自同一文件路径
                    if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName) {
                        //返回已经存在的进程
                        return process;
                    }
                }
            }
            return null;
        }

        private static void HandleRunningInstance(Process instance) {
            MessageBox.Show("程序已经在运行！", "提示信息", MessageBoxButtons.OK);
            try {
                ShowWindowAsync(instance.MainWindowHandle, 1);  //调用api函数，正常显示窗口
                SetForegroundWindow(instance.MainWindowHandle); //将窗口放置最前端
                FrmDefault.GetInstance().FrmShow();
            } catch (Exception ex) {
                log.Error(ex.Message);
            }
            Application.Exit();
        }

        [DllImport("User32.dll")]
        private static extern bool ShowWindowAsync(System.IntPtr hWnd, int cmdShow);

        [DllImport("User32.dll")]
        private static extern bool SetForegroundWindow(System.IntPtr hWnd);

        #endregion

    }
}
